pgsql-server/src backend/executor/nodeIndexsca ...
Started by Tom Lanealmost 23 years ago1 messagescomitters
CVSROOT: /cvsroot
Module name: pgsql-server
Changes by: tgl@svr1.postgresql.org 03/08/22 17:26:43
Modified files:
src/backend/executor: nodeIndexscan.c
src/include/nodes: execnodes.h
Log message:
Tweak processing of multiple-index-scan plans to reduce overhead when
handling many-way scans: instead of re-evaluating all prior indexscan
quals to see if a tuple has been fetched more than once, use a hash table
indexed by tuple CTID. But fall back to the old way if the hash table
grows to exceed SortMem.